Dyfyniad APA

Public Health Research & Practice | Sax Institute. Cambridge University Press.

Dyfyniad Arddull Chicago

Public Health Research & Practice | Sax Institute. Cambridge University Press.

Dyfyniad MLA

Public Health Research & Practice | Sax Institute. Cambridge University Press.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.